This is a discussion on ??What oil should I use?? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I've used M1 for many years and always been very happy with it. Last car was an 06 WRX I ...

I've used M1 for many years and always been very happy with it. Last car was an 06 WRX I had from new but I've just gotten a 12 STi and I'm planning on using Royal Purple in it. I've been reading quite a few reviews of Royal Purple and have yet to see any negative comments. Curious what experience any of you folks have had using it.

First read the bottle. If it does not meet Sunaru's spec (in terms of grade, not just viscosity) its not correct and won't meet your warranty requirements.

Second disregard opinions. They are useless.

Data matter. Nothing else. Experiences are stories; they are not data so they are more suitable for water cooler discussions than actual analysis. Data will tell you wear rates, rate of viscosity breakdown, TBN initial and final values -- actual useful information.

If its not data don't bother.

WRX Info Links, Courtesy TheJMan is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis ZorbasI lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

In my opinion SD doesn't know what he's talking about. But as he said opinions are useless so what does it matter!

Any synthetic oil in the right viscosity is going to be just fine at the end of the day. I almost just bought a jug of Castrol for my cars because I wanted to try it out, although I've used Mobil 1 exclusively for 15 years now. But I didn't because I don't really think it makes that much of a difference what I buy as long as it's a name brand synthetic in the right weight.

WRX Info Links, Courtesy TheJMan is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis ZorbasI lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

Guarantees are absolutely worthless, if not offensive. I consider them a negative point against the product rather than an advantage.

WRX Info Links, Courtesy TheJMan is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis ZorbasI lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

Royal purple has been proven to break down allot faster for daily driving. Royal purple was meant for track use, beat on it and change it. Mobil 1 is great, been a Mobil 1 fan for years. But I have started running full synthetic rotella t. This is the same stuff generations before use used in farm equipment, semi over the road trucks and pretty much every moto event, drag event, monster Truck event, poke around the pits and you will see lots of people running rotella. Its amazing. does not break down, and is tried and true across the board. And is allot cheaper than cooler named oils lol.

It is fantastic (absolutely fabulous, no less!) that Amsoil was not in that test. I don't like dealing with that product at all.

The test in and of itself was useful if -- and only if -- one is interested in protecting the specific bearing shown. If so, I'd follow the test results. However I don't see any relevance between the test performed and how any of the oils tested will perform in an engine. For that, there are UOA data widely available (though not for many of the specific products tested, since they are AU market versions).

One useful piece of info many here would find startling is how much more expensive fluids are outside the US.

WRX Info Links, Courtesy TheJMan is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis ZorbasI lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

I use Supertech sometimes; in fact it's in my daily driver (Toyota) right now and I keep it around as top up oil for three of my cars (Honda, Toyota, Subaru).

I have read there are various sources but have yet to read anything proving via data that it is anything but competent. I would be interested to see someone's data if they are negative, as the data and even the (meaningless compared to data, but interesting nonetheless) comments I've seen tend to be quite positive.

In fact, here is an interesting report from a member of another forum:

The only issue in my mind is that "Supertech" is ill defined. The suppliers may change, meaning someone different may make the oil more frequently than we'd think. I don't know that this makes any difference, but then again it's hard to judge someone on the basis of its past performance if that something can change. Other than that though I see no reason to avoid it.

Last edited by SD_GR; 10-04-2012 at 01:36 PM.

WRX Info Links, Courtesy TheJMan is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis ZorbasI lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

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